Positioning structure of roller adapted for an auto document feed apparatus

ABSTRACT

A positioning structure of roller adapted for auto document feed apparatus includes a flexible shaft and a flexible arm. Wherein the flexible arm has a first portion integrally formed with the flexible shaft, a second portion is arranged on a clamping portion of auto document feed apparatus, and a third portion is formed between the first portion and the second portion. Thereby, reducing higher manufactured cost and tedious processes, indirectly, decrease longer time of fabrication and maintainability.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a positioning structure of roller, and in particular to a positioning structure of roller for use in an auto document feed apparatus that can provide a driven roller for being securely contacted with an active roller.

[0003] 2. Description of the Prior Art

[0004] Please refer to the FIG. 1 and FIG. 2, a positioning structure of roller adapted for auto document feed apparatus according to the prior art is shown as reference number 1, which is arranged in such as printer, auto document feed and fax machine, etc. A support portion 11 is arranged on a plastic plate (not shown) of the auto document feed apparatus. The support portion 11 has an opening 12. A metal rod 13 is passed through the opening 12 and arranged on the support portion 11. A driven roller 14 is bushed the metal rod 13, for contacting an active roller (not shown). A spring 15 is positioned in the opening 12 under the metal rod 13, to against the metal rod 13.

[0005]FIG. 3 and FIG. 4 are shown another embodiment of the prior art, a positioning structure of roller adapted for auto document feed apparatus according to the prior art is shown as reference number 2. A support portion 21 is arranged on a plastic plate (not shown) of the auto document feed apparatus. The support portion 21 has an opening 22. A metal rod 23 is passed through the opening 22 and arranged on the support portion 21. A driven roller 24 is bushed the metal rod 23, for contacting an active roller (not shown). A screw 26 locked a spring band 25 on the plastic plate (not shown) to deliver paper.

[0006] Moreover, a structure design of the auto document feed apparatus while conveys paper, for providing a function of deliver. Due to some manufacture technology limitations, to be restricted of manufactured cost and fabrication on production line. Therefore, the qualities of taught manufacture technology limitations, so that the positioning structure of roller adapted for auto document feed apparatus can not be easily fabricated and fast maintained, thus the manufactured cost will be also increased.

[0007] Following the upgraded rapidly of the industry, such that the life of humans is also changed; fast, convenient, easy, light, handy and cheap is a code word of the modern. However, the taught positioning structure of roller adapted for auto document feed apparatus is unfavorable to repair, replace and maintain. Simultaneously, the manufactured cost and the difficulty of fabrication are increased, too. Today the requirements of positioning structure of roller adapted for auto document feed apparatus known in the prior art could not be reached.

[0008] Further, in according to the Mechanical Engineering, we know that a force is pressured on a non-uniform shaft or a different element on the shaft, a torque or a bending moment will be generated. Thereby, to cause the angular velocity to be different between the driven roller and the active roller, making the paper block up, even the shaft is deformed or broken via unsuitable use.

[0009] Accordingly, as above description we knowing the positioning structure of roller adapted for auto document feed apparatus known in the prior art having exists a non-convenience and defect in using practically.

[0010] Therefore, the present invention is directed to an improved the positioning structure of roller adapted for auto document feed apparatus with the inventor's research hardly and the application of theorem having a reasonable design and lower manufactured cost thereon.

SUMMARY OF THE DISCLOSURE

[0011] It is an object of the present invention to provide a positioning structure of roller adapted for auto document feed apparatus, the positioning structure of roller is integrally formed by a flexible arm and a flexible shaft, to decrease the manufactured cost and production.

[0012] It is another object of the present invention to provide a positioning structure of roller adapted for auto document feed apparatus, to achieve the roller positioning and the function of delivering paper with more simplistic, and further corresponds to the micro scale trend.

[0013] In order to achieve the above objectives of the invention that provides a positioning structure of roller adapted for an auto document feed apparatus having a transmission shaft, an active roller is bushed the transmission shaft, and a driven roller rotationally is contacted with the active roller; the positioning structure of roller is comprising a flexible shaft pivotally contacted with the driven roller of the auto document feed apparatus; and a flexible arm is having a first portion integrally formed with the flexible shaft, a second portion is fixedly arranged on a clamping portion of the auto document feed apparatus, and a third portion is formed between the first portion and the second portion, for providing a reaction force against the active roller.

[0014] From the present invention, the flexible shaft is pivotally contacted with the driven roller of the auto document feed apparatus, and the second portion of the flexible arm is fixedly arranged on the clamping portion of the auto document feed apparatus, to cause the driven roller to be closely fastened the active roller of the auto document feed apparatus via elasticity from the third portion of the flexible arm.

[0015] In the cause of examiner or judge can further knowing in other objects, feathers and technological subject matters of the invention will be apparent from the following detailed description taken in connection with the accompanying drawings. However, the present examples and embodiments are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given herein.

BRIEF DESCRIPTIONS OF THE DRAWINGS

[0016] The present invention can be fully understood from the following detailed description and preferred embodiment with reference to the accompanying drawings in which:

[0017]FIG. 1 is a perspective view of a conventional positioning structure of roller adapted for auto document feed apparatus;

[0018]FIG. 2 is a schematic top view of FIG. 1;

[0019]FIG. 3 is a perspective view of a conventional positioning structure of roller adapted for auto document feed apparatus;

[0020]FIG. 4 is a schematic top view of FIG. 3;

[0021]FIG. 5 is an exploded view according to the present invention;

[0022]FIG. 6 is a perspective view according to the present invention;

[0023]FIG. 7 is a local cross-sectional view according to the present invention, which appears the flexible shaft pivotally contacted with the opening of plastic roller and integrally formed with the first portion of the flexible arm;

[0024]FIG. 8 is a perspective view according to the present invention, which is arranged a row and acted on the active roller with each other.

[0025]FIG. 9 is a perspective view of another embodiment according to the present invention; and

[0026]FIG. 10 is a perspective view of another embodiment according to the present invention, which is arranged a row and acted on the active roller with each other.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] The following detailed description is of the best presently contemplated modes of carrying out the invention. This description is not to be taken in a limiting sense, but is made merely for the purpose of illustrating general principles of embodiments of the invention. The scope of the invention is best defined by the appended claims.

[0028] Although the embodiments of the present invention are described below in connection with a positioning structure of roller adapted for auto document feed apparatus, the present invention can be applied to all auto document feed apparatus, including but not limited to multi-function peripherals, printers, copiers, fax machines, as well as all other auto document feed apparatus and feed paper machines.

[0029] Please refer to FIGS. 5-8 illustrate a positioning structure of roller adapted for auto document feed apparatus, wherein the auto document feed apparatus has a transmission shaft 36, an active roller 34 is bushed the transmission shaft 36, and a driven roller 33 is rotationally contacted with the active roller 34.

[0030] The positioning structure of roller has a flexible shaft 31; and a flexible arm 32 is integrally formed with the flexible shaft 31, and a clamping portion 35 of the auto document feed apparatus clamps the flexible arm 32 therein. The flexible shaft 31 is made of steel having a spring shape, and the flexible shaft 31 spirally extends along an axial line of the flexible shaft 35. The driven roller 33 includes a plastic roller 331 and a rubber surface 332, the rubber surface 332 sticks on the plastic roller 331, and an opening 333 is formed on each side of the plastic roller 331. The opening 333 of the plastic roller 331 is bushed the flexible shaft 31, to cause the driven roller 33 rotationally contact the active roller 34. The flexible shaft 31 is pivotally contacted with the opening 333 of the plastic roller 331.

[0031] The flexible arm 32 is made of steel and having elasticity, the flexible arm 32 is having a first portion 321, and the first portion 321 is integrally formed with the flexible shaft 31. A second portion 323 of the flexible arm 32 is a curve shape, for mounting in the clamping portion 35. A third portion 322 of the flexible arm 32 is integrally formed between the first portion 321 and the second portion 323. Whereby, using the second portion 323 of flexible arm 32 mounted in the clamping portion 35 while the active roller 34 pressures a force on the driven roller 33, the third portion 322 of the flexible arm 32 is providing an reaction force to the first portion 321 of the flexible arm 32. The clamping portion 35 is fixedly clamping the second portion 323 of the flexible arm 32 in a desired space, and a suitable angle is providing in the second portion 323, for the convenience to fabricate, repair and maintain the driven roller 33 at a later date.

[0032] As shown in FIG. 7, from the local cross-sectional view according to the present invention, we know that the flexible shaft 31 is mounted in the opening 333 of the plastic roller 331, and is pivotally contacted with the plastic roller 331 therein. The first portion 321 of the flexible arm 32 is integrally formed with the flexible shaft 31.

[0033] Please refer to FIGS. 9 and 10 illustrate a positioning structure of roller adapted for auto document feed apparatus, wherein the auto document feed apparatus are having a transmission shaft 36, an active roller 34 is bushed the transmission shaft 36, and a driven roller 43 is rotationally contacted with the active roller 34. The positioning structure of roller is having a flexible shaft 41; a flexible arm 42 is integrally formed with the flexible shaft 41, and a clamping portion 45 of the auto document feed apparatus clamps the flexible arm 42 therein. The flexible shaft 41 is made of steel having a spring shape, and spirally extends along an axial line of the flexible shaft 45. The driven roller 43 includes a plastic roller 431 and a rubber surface 432, the rubber surface 432 sticks on the plastic roller 431, and an flange 433 is formed on each side of the plastic roller 431. The flange 433 of the plastic roller 431 is bushed the flexible shaft 41, to cause the driven roller 43 rotationally contact the active roller 34. The flexible shaft 41 is pivotally contacted with the flange 433 of the plastic roller 431.

[0034] The flexible arm 42 is made of steel and having elasticity, the flexible arm 42 is having a first portion 421, and the first portion 421 is integrally formed with the flexible shaft 41. A second portion 423 of the flexible arm 42 is a curve shape, for mounting in the clamping portion 45. A third portion 422 of the flexible arm 42 is integrally formed between the first portion 421 and the second portion 423. Whereby, using the second portion 423 of flexible arm 42 mounted in the clamping portion 45 while the active roller 34 pressures a force on the driven roller 43, the third portion 422 of the flexible arm 42 is providing an reaction force to the first portion 421 of the flexible arm 42. The clamping portion 45 is fixedly clamping the second portion 423 of the flexible arm 42 in a desired space, and a suitable angle is providing in the second portion 423, for the convenience to fabricate, repair and maintain the driven roller 43 at a later date.

[0035] A prototype of positioning structure of roller adapted for auto document feed apparatus has been constructed herein with feathers as above descriptions, the present invention is with steel by means of the manufacture of a mechanical process formed in unity, decreasing the manufactured cost and time of fabrication substantially, wherein by means of the elastic property of material and the different shape design of clamping portion of the auto document feed apparatus, to increase the convenience of the using, fabrication and repair. From Von Mises-Hencky theorem we can get more ability of the anti-stress and anti-strain than the taught metal rod or plastic rod. Simultaneously, the present invention eliminates more structures and elements of the auto document feed apparatus than the prior art, and get the best function of delivering paper. Whereby, collocating the different shape design of clamping portion of the auto document feed apparatus also can save more space. Therefore, the present invention improve the defect of the known positioning structure of roller adapted for auto document feed apparatus in prior art that cannot effectively decrease higher manufactured cost and longer time of fabrication and maintainability. Moreover, the present invention is also reduced the volume of positioning structure of roller substantially, for corresponding to the fashion of modern.

[0036] To conclude above description, according to the patent law, the present invention is fully corresponding with the utility, novelty and un-obviousness of the invention patent application important document, therefore ask to apply for. Hope can detailed examine and approve the present invention, to protect the inventor 's rights.

[0037] Although particular embodiment of the invention has been described in detail for purpose of illustration, various modifications and enhancements maybe made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims. 

What is claimed is:
 1. A positioning structure of roller adapted for an auto document feed apparatus having a transmission shaft, an active roller bushed the transmission shaft and a driven roller rotationally contacted with the active roller; the positioning structure of roller, comprising: a flexible shaft pivotally contacted with the driven roller of the auto document feed apparatus; and a flexible arm having a first portion integrally formed with the flexible shaft, a second portion fixedly arranged on a clamping portion of the auto document feed apparatus, and a third portion formed between the first portion and the second portion, for providing a reaction force against the active roller.
 2. The positioning structure of roller as claimed in claim 1, wherein the flexible shaft has a spring shape spirally extending along an axial line thereof.
 3. The positioning structure of roller as claimed in claim 2, wherein the flexible shaft is pivotally contacted within an opening of the driven roller.
 4. The positioning structure of roller as claimed in claim 2, wherein the flexible shaft is pivotally contacted around a flange of the driven roller.
 5. The positioning structure of roller as claimed in claim 1, wherein the second portion of the flexible shaft has a curve shape, for inserting and locking in the clamping portion. 